THE CHANGES IN THE POPULATION OF THEODOXUS FLUVIATILIS IN THE RIVER TYWA WESTERN POMERANIA (POMORZE ZACHODNIE) IN THE BACKGROUND OF THE ABIOTIC HABITAT

Abstract

The paper presents the research on the concentration and biomass of the gastropod Theodoxus fluviatilis found in the river Tywa (Western Pomerania). It has been stated that the strongest influence on the size of the concentration of those species had the following elements of habitat: the kind of the bed, amount of food, depth of water, degree of its transformation. However, the interrelation between the concentration of species and their biomass has not been noticed.

Keywords

• populacja Theodoxus fluviatilis
• rzeka Tywa
• zagęszczenie
• biomasa